1999 Other Mitsubishi Models NO ELECTRIC OVERDRIVE SHIFT

mtrdude · Posted at Tue Sep 08, 2009 9:15 am

1999 Other Mitsubishi Models 4 cyl Two Wheel Drive Automatic 153000 miles

VIN #JW6AAF1H3YL002649 / TRANSMISSION #8I0369.
This is a 1999 Mitsubishi Fuso cabover truck with a diesel engine & 3-spd automatic trans with an electronic (push-button) overdrive gear. The trans wasn't shifting right and the speedometer wasn't working so I replaced both the cable gear as well as the internal shaft gear (both were bad) and the speedometer works fine. The electronic overdrive button is located on the shifter handle and the dash light indicates whether it is in on or off position; the light is working. The transmission shifts normally from low to second to high gear but then won't shift into OD; truck will run around 50 mph but engine rpm is 3300 and dash gauge shows redline at 3500 rpm. Have a thought that the speed sensor might be bad but don't have any diagnostics to check nor do I know what a good sensor should ohm out at. Need suggestions or diagnostic procedure to find out what the problem is.

Docfixit · Posted at Mon Sep 14, 2009 10:08 am

Hi
Input speed sensor on front trans. disconnect soleniod plug, see figure,measure ohms across term. 9-10. should be 560-680 ohms. same plug measure across term. 3-4 560-680 ohms. if out of range replace.

Hope this helps
Thanks for donate

mtrdude · Posted at Wed Sep 16, 2009 3:23 am

Solenoid plug is only 8 pin, not 10 pin.

Docfixit · Posted at Thu Sep 17, 2009 8:08 am

Did you locate speed sensors? if yes make ohm checks at sensor acrosss terminals.

mtrdude · Posted at Fri Sep 18, 2009 3:20 am

It has one speed sensor; since it is an 8-pin setup what # pins should I check and what should the resistance be?

Docfixit · Posted at Fri Sep 18, 2009 11:31 am

560-680 ohms at sensor terminals